By Martin Erickson

ISBN-10: 0883858290

ISBN-13: 9780883858295

Every mathematician (beginner, beginner, alike) thrills to discover basic, dependent recommendations to likely tough difficulties. Such satisfied resolutions are referred to as ``aha! solutions,'' a word popularized by way of arithmetic and technology author Martin Gardner. Aha! ideas are outstanding, beautiful, and scintillating: they exhibit the wonderful thing about mathematics.

This ebook is a suite of issues of aha! ideas. the issues are on the point of the varsity arithmetic scholar, yet there can be whatever of curiosity for the highschool pupil, the trainer of arithmetic, the ``math fan,'' and a person else who loves mathematical challenges.

This assortment comprises 100 difficulties within the parts of mathematics, geometry, algebra, calculus, likelihood, quantity thought, and combinatorics. the issues begin effortless and usually get more challenging as you move during the e-book. a number of suggestions require using a working laptop or computer. a major characteristic of the publication is the bonus dialogue of similar arithmetic that follows the answer of every challenge. This fabric is there to entertain and tell you or element you to new questions. in the event you do not keep in mind a mathematical definition or notion, there's a Toolkit at the back of the booklet that might help.

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**Sample text**

A JENSEN'S INEQUALITY. Suppose that f is convex on I. If a I, ... , an E I and AI, ... , An are nonnegative real numbers such that Al + ... + An = I, then Equality occurs if and only if all the aj are equal or f is a linear function. , f is concave downward), as is the case for the sine function in our Problem, then the inequality is reversed. Let's prove Jensen's inequality in the case where n = 4 and A = 1/2. Since f is convex (we'll take the interval I for granted), f (a + b) < f(a) + f(b) 2 ' 2 with equality if and only if a = b (we'll assume that can use this hypothesis twice: f (a l + a2 : a3 + a4 ) = f f is not a linear function).

Aha! solutions are to be found! 1 Algebra Passing Time At some time between 3:00 and 4:00, the minute hand of a clock passes the hour hand. Exactly what time is this? ) Solution Let's solve the problem in a mundane way first (before giving an aha! solution). We reckon time in minutes from the top of the hour (12 on the clock). Suppose that the minute hand is at t minutes and the hour hand is, correspondingly, at 15 + t /12 minutes. ) When the two hands coincide, we have t = 15 + t /12, and hence t = 16 + 4/11.

Now that we know the symmetry group of the cube (S4), we find that the symmetry group of the regular tetrahedron goes along for the ride. Every symmetry of the cube automatically gives a symmetry of the regular tetrahedron (with the tetrahedron inscribed in the cube), or it moves the vertices of the tetrahedron to the other four vertices of the cube. How many symmetries of the regular tetrahedron are there? Since we can put the tetrahedron down on any of its four faces and then rotate the tetrahedron in any of three ways, the regular tetrahedron has 4ยท3 = 12 symmetries.

### Aha! Solutions by Martin Erickson

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